Debug::Trace - Perl extension to trace subroutine calls

       Jan-Pieter Cornet <jpc@cpan.org>; Jos Boumans <kane@cpan.org>; Johan Vromans <jv@cpan.org>;

       This is an Amsterdam.pm production. See http://amsterdam.pm.org.

       Current maintainer is Johan Vromans <jv@cpan.org>.

       Copyright 2002,2013 Amsterdam.pm. All rights reserved.

       This program is free software; you can redistribute it and/or modify it under  the  same  terms  as  Perl
       itself.

perl v5.40.1                                       2025-05-04                                  Debug::Trace(3pm)

       Debug::Trace instruments subroutines to provide tracing information upon every call and return.

       Using Debug::Trace does not require any changes to your sources. Most often, it will be used from the
       command line:

         perl -MDebug::Trace=foo,bar yourprogram.pl

       This will have your subroutines foo() and bar() printing call and return information.

       Subroutine names may be fully qualified to denote subroutines in other packages than the default main::.

       By default, the trace information is output using the standard warn() function.

   MODIFIERS
       Modifiers can be inserted in the list of subroutines to change the default behavior of this module. All
       modifiers can be used in three ways:

       •   ":"name to enable a specific feature.

       •   ":no"name to disable a specific feature.

       •   ":"name"("value")"  to  set  a  feature  to  a  specific  value. In general, ":"name is equivalent to
           ":"name"(1)", while ":no"name corresponds to ":"name"(0)".

       The following modifiers are recognized:

       :warn
           Uses warn() to produce the trace output (default). ":nowarn" Sends trace output directly to STDERR.

       :caller
           Add basic call information to the trace message, including from where the routine was called, and  by
           whom. This is enabled by default.

       :stacktrace
           Add a stack trace (call history).

       :maxlen(length)
           Truncate the length of the lines of trace information to length characters.

       The  following  modifiers can be used to control the way Data::Dumper prints the values of parameters and
       return values. See also Data::Dumper.

       :indent
           Controls the style of indentation. It can be set to 0, 1, 2 or 3.  Style 0 spews output  without  any
           newlines, indentation, or spaces between list items. :indent(0) is the default.

       :useqq
           When enabled, uses double quotes for representing string values.  Whitespace other than space will be
           represented  as  "[\n\t\r]", "unsafe" characters will be backslashed, and unprintable characters will
           be output as quoted octal integers. This is the default, use ":nouseqq" to disable.

       :maxdepth(depth)
           Can be set to a positive integer that specifies the depth beyond which which we don't print structure
           contents. The default is 2, which means one level of array/hashes in argument lists and return values
           is expanded.  If you use ":nomaxdepth" or :maxdepth(0), nested structures are fully expanded.

       :quotekeys
           Controls wether hash keys are always printed quoted. The default is ":noquotekeys".

       sortkeys
           Controls whether hash keys are dumped in sorted order. The default is ":nosortkeys".

       Modifiers apply only to the subroutines that follow in the list of arguments.

       Environment variable "PERL5DEBUGTRACE" can be used to preset initial modifiers, e.g.:

           export PERL5DEBUGTRACE=":warn:indent(2):nomaxdepth:quotekeys"

       None, actually. Everything is handled by the module's import.

       Debug::Trace - Perl extension to trace subroutine calls

       Data::Dumper, Carp

         perl -MDebug::Trace=foo,bar yourprogram.pl